And of course, there was Binaural experiments going on too. Using a "Kuntskopf" head (sp?)
With microphones mounted inside a polystyrene bonce, exactly where your ears would be!
Obviously, you had to listen back on headphones, to keep the phase differences correct, but, I have a demo disc from Sennheiser, and it's really quite an eery effect.
I remember, during a night shift, going up to Regents Park, with 2 mics stuck in my ears, recording the ducks! How sad is that!
The Beeb also experimented with encoded Quadrophonic surround sound (even recorded an episode of the Archers using it!) But the decoding kit was prohibitively expensive. Nonetheless, nice to know that attempts were made!